No vacant land and buildings hereafter erected or altered shall be occupied, or used in whole or in part, nor shall any owner or tenant of any land or building hereafter change the use classification or enlarge the use in any building or on any premises without a certificate of occupancy from the city council. Reference should be made to this code concerning building, electrical and plumbing permit processes. (Ord. 96-5, 10-9-1996)